Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires vimeo/psalm 6.12.0 -> satisfiable by vimeo/psalm[6.12.0]. - vimeo/psalm 6.12.0 requires php ~8.1.31 || ~8.2.27 || ~8.3.16 || ~8.4.3 -> your php version (8.0.30) does not satisfy that requirement.